The comming Olympus 7-14 mm f2.8 lens will not fit in an Nauticam housing due the lens diameter (approx 80 mm) is wider the maximum inner diameter (approx 73 mm) of the Nauticam port system.
This was a real bummer as I was looking foward to getting a f2.8 wide angle lens.
Lets hope the upcomming Olympus fisheye 8.0 mm f1.8 is a better match. At least it looks slimmer in the pictures.
Picture below shows both Pana and Oly 7-14 mm lenses on an GH4 body courtesy of the 43.org site.